All Concepcion showed is that he has heart. He is unbelievably slow for super flyweight, David Diaz would throw 5 punches before dude gets off with 1.
I like Arce, but he's done, even while Concepcion was dumb slow he would hit him clean with 1 or 2 slug slow, wide shots. The only thing Arce has left is his heart, determination, and some of his power, it won't be enough to beat any paper champ or top contender. Any bantam, super fly, fly weight with decent speed and stamina would stop him.
The only question remaining is, when will Arum cash out his cash cow? Arce will never be a titleholder and will either be brutally stopped or be beaten in a one sided fight as soon as he steps up.